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04-23-2009, 06:08 PM | #1 | |
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2000 Jimmy 4x4 Problem
Hi all,
I have done some troubleshooting to try and get my 4x4 to engage. I have replaced the actuator, solenoid vacuum switch on the firewall and the 4x4 indicator switch by the front axle. I have a good vacuum to the actuator; the cable is not binding although the actuator will only compress about 2/3 closed. The Auto, 4HI and 4 Low lights blink continuously when pressed, I can hear the TCCM clicking, the transfer case switches when 4 Low is selected, but the lights still flash. No trouble lights on dash. I removed the battery and tried assisting the actuator but was unable to get the front axle to engage. I jacked up the passenger front wheel, pressed the 4 HI button while slightly moving the front wheel and squeezing the actuator……… the front axle engaged and the light stayed solid. This worked in 4 Low and AutoTrac as well. When the front axle engaged, I was unable to rotate the front wheel so I am assuming the axle locked as it should. So what the heck is going on? Could there be a problem in the front diff, I’m hoping someone can provide some direction as I believe I’ve eliminated all other potential problems as far as TCCM, bad vacuum, switches etc. It seems like everything will work fine if I can figure out how to get the coupler to engage….. or why it will not engage!! Thanks for your help. |
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04-24-2009, 08:26 AM | #2 | ||
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Re: 2000 Jimmy 4x4 Problem
Quote:
Chek for full enginge vacuum to it and solenoid and diaphram not leaking or putting full vacuum to it. Good luck and let us know what you find.
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Remember proper testing gives us the answer to many problems. MT |
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04-24-2009, 10:54 AM | #3 | |
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Re: 2000 Jimmy 4x4 Problem
Thanks for your help MT, I'll keep looking for a vacuum leak. The front axle "will not" engage with a hand assist to the actuator if I do not jack up the front passenger wheel and lightly rock it? I've tried manually squeezing the actuator with all 4 wheels on the ground and no go, only when the wheel is raised and slowly rocked?
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04-24-2009, 12:43 PM | #4 | ||
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Re: 2000 Jimmy 4x4 Problem
Quote:
The axel shift gears inside have to spline up before it will lock in. If you hit 4W and let it roll back or forward a little and it goes in 4W and axel locks up and light quits flashing all is ok. Good Luck
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Remember proper testing gives us the answer to many problems. MT |
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04-24-2009, 02:02 PM | #5 | |
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Re: 2000 Jimmy 4x4 Problem
Thanks MT.... I'm going to put a vacuum guage on the actuator inlet hose. Do you happen to know how many inches of vacuum I should read on the guage to get a proper pull? Thanks.
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04-24-2009, 03:46 PM | #6 | |
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Re: 2000 Jimmy 4x4 Problem
__________________
Remember proper testing gives us the answer to many problems. MT |
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04-24-2009, 07:51 PM | #7 | |
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Re: 2000 Jimmy 4x4 Problem
I'm stumpped? I have 19 in hg to the newly replaced actuator, the cable was replaced 6 months ago and I can't get the front axle to couple without assisting the actuator by adding a little bit of hand pressure. When I press on the actuator, it only travels about another 1/8 -1/4 inch and then it engages and everything is fine. I'm wondering if the binding could be happening inside the front diff..... just grassping at straws now????
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04-25-2009, 07:52 AM | #8 | ||
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Re: 2000 Jimmy 4x4 Problem
Quote:
__________________
Remember proper testing gives us the answer to many problems. MT |
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04-25-2009, 05:55 PM | #9 | |
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Re: 2000 Jimmy 4x4 Problem
Hey MT!!! I got 4x4 working! I rechecked the vacuum lines and found a hole in the line from the solenoid switch to the actuator. Replaced and everything is working great.
Thanks for all your help, I really appreciate the dedication you Mod's provide..... great support site. Again, thanks alot MT! |
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04-25-2009, 06:03 PM | #10 | ||
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Re: 2000 Jimmy 4x4 Problem
Quote:
Good find on vacuum line. Glad you found it. MT
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Remember proper testing gives us the answer to many problems. MT |
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07-01-2009, 01:48 PM | #11 | |
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Re: 2000 Jimmy 4x4 Problem
I have a similar/related issue. I found a forum on Yahoo that stated this about a 2000 Blazer. Can anyone verify if it is true?
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXX Your Blazer shouldn't have a vacuum switch. In the passenger side kick panel there is a Transfer Case Control Module. (TCCM) You might have heard a clicking sound coming this area... I've recently repaired two 2000 Chevy 4X4's with basically the same troubles (no 4 wheel drive). This a known issue with these trucks, problems with corrosion built up on the pins (contacts). You can clean the contacts of both the harness and the motor and apply die-electric grease to them and you should be good to go 4 wheelin... Hope this solves your problem!! XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX I cannot find the Transfer Case Vacuum Switch. The Actuator under the battery leads right down into the Transfer case on the passenger side. It does not go to a Vaccuum Switch as described elsewhere on this forum. The prob I have is some times the Right front end will sound kind of like a roar when getting to about 30 mph. If I stop and put in to 4wd and back to 2wd it will stop doing that. So I think the 4wd is trying to engage partially at times. Any help is appreciated. |
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07-01-2009, 01:58 PM | #12 | ||
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Re: 2000 Jimmy 4x4 Problem
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If you need help start your on New thread and give us all info and someone will try to help you.
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06-07-2010, 07:27 PM | #13 | |
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Re: 2000 Jimmy 4x4 Problem
Wow, people, the guy was only trying to help.
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